Tracking non-uniform flooding fronts of gas injection in oil reservoirs

摘要

Downhole gravity measurements are used to monitor the volumetric sweep of CO₂ and estimate the fingering phenomenon if any. The gravity measurements have been found to be effective due to the high density contrast between CO₂ and brine or oil which provides better and higher sensitivity. An analytical forward model is used to determine the location and shape characteristics of the flooding front. A strategy to monitor the movement of the CO₂ flooding front and to predict the fingering phenomenon is used to provide a warning tool to improve the sweep efficiency, according to some embodiments.